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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Investment income from portfolios        
Equity in earnings (losses) of limited partnerships $ 11,504 $ 3,615 $ 26,701 $ (2,419)
Total investment income 19,182 11,155 50,596 21,425
Less: investment expenses 324 510 991 1,072
Net investment income 18,858 10,645 49,605 20,353
Available-for-sale securities        
Investment income from portfolios        
Available-for-sale, equity securities, cash equivalents, and other 5,786 5,353 17,773 16,811
Equity securities        
Investment income from portfolios        
Available-for-sale, equity securities, cash equivalents, and other 1,030 1,178 3,348 2,935
Cash equivalents and other        
Investment income from portfolios        
Available-for-sale, equity securities, cash equivalents, and other $ 862 $ 1,009 $ 2,774 $ 4,098